Miniature Circular Power Saw
Scale down to 43% for about 1/10th scale size, originally made for RC Rock Crawler Accessory, or a Diorama piece
2pc Saw + Blade separate for highest resolution of the blade
or Print as one piece with blade attached
.2mm layer height should be decent but .1mm or better for finest results
Lots of support and support brim.
Add a keychain ring and you got yourself a really cool keychain
Add a hook and you got yourself a Tree Ornament :P